i was watching the history of snipers and it was:

For a long shot, Breathe in and then hold it, BANG.

For close shot, Breathe out, hold it, BANG.

Sometimes when im shoot and i just need it to be a air higher i'll adjust my breath and breathe in a little more air and it usually takes it up to where i need it. There are some interesting ways to do things right. The way you hold the rifle, your breathing, exe.